Multiple Choice
Why are valence electrons important in chemistry?
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10. Periodic Properties of the Elements
Valence Electrons of Elements
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How many valence electrons does an atom of iodine (I) possess?
A
8
B
5
C
7
D
6
Verified step by step guidance1
Identify the group number of iodine (I) in the periodic table. Iodine is in Group 17, which is also known as the halogens group.
Recall that elements in Group 17 have 7 valence electrons because they have seven electrons in their outermost s and p orbitals.
Understand that valence electrons are the electrons in the outermost shell of an atom that participate in chemical bonding.
Confirm that iodine's electron configuration ends in 5s² 5p⁵, indicating 2 electrons in the s subshell and 5 electrons in the p subshell of the outermost shell.
Sum the electrons in the outermost shell: 2 (from s) + 5 (from p) = 7 valence electrons for iodine.
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